WO2014069107A1

WO2014069107A1 - Substrate with built-in component, and communication terminal apparatus

Info

Publication number: WO2014069107A1
Application number: PCT/JP2013/074654
Authority: WO
Inventors: 馬場　貴博; 祐貴若林
Original assignee: 株式会社村田製作所
Priority date: 2012-10-31
Filing date: 2013-09-12
Publication date: 2014-05-08
Also published as: JPWO2014069107A1; US20150163918A1; US9699908B2; CN204518238U

Abstract

In order to individually inspect each of the electronic components, and to further reduce a wiring space, a substrate (1) with a built-in component includes: a first resin layer (2c), which has formed therein a space for housing an electronic component (3), and which has at least one first interlayer connecting body (6a) on the outer side of each of at least the three sides of a main surface of the electronic component (3); and a second resin layer (2d) having at least one second interlayer connecting body (6b) on the outer side of each of at least the three sides of the main surface, and a plurality of third interlayer connecting bodies (6c) that are directly bonded to a plurality of terminal electrodes. The first resin layer (2c) and the second resin layer (2d) are adjacent to each other in the laminating direction in a multilayer substrate (2), and the first interlayer connecting body (6a) and the second interlayer connecting body (6b) are directly bonded to each other.

Description

Component built-in board and communication terminal device

The present invention relates to a component-embedded substrate in which electronic components are embedded in a multilayer substrate, and a communication terminal device including the same.

Examples of conventional component-embedded substrates include those described in Patent Document 1 below. In this component-embedded substrate, an electronic component (semiconductor chip) in which stud bumps are provided on a plurality of electrodes on the first surface and a thermosetting resin film (first layer) on which a pad is formed are thermoplastic resin. It arrange | positions in the direction where a stud bump and a pad face through a film (2nd layer). Here, the pad and the stud bump, and the electrode and the stud bump are joined in a pressurizing / heating process.

The second layer is laminated with a thermosetting film (third layer) in which a cavity for accommodating electronic components is formed. In this electronic component, another electrode group is provided on the second surface facing the first surface for wiring or heat dissipation. The third layer is laminated with a thermoplastic resin film (fourth layer) on which an interlayer connection body to be joined to the electrode group provided on the second surface of the semiconductor chip is formed.

JP 2011-222553 A

In the component-embedded substrate, the interlayer connection formed in the first layer and the second layer is electrically connected to each other through the pattern conductor. The third-layer and fourth-layer interlayer connectors are also electrically connected to each other through the pattern conductor.

On the other hand, the second-layer interlayer connection body and the third-layer interlayer connection body are directly joined without using a pattern conductor. Here, in the second layer, at least one interlayer connection body is provided outside two opposite sides of the first surface (or second surface) of the semiconductor chip. In the third layer, the interlayer connection body is provided at the same position as the interlayer connection body of the second layer when viewed in plan from the stacking direction of the first layer to the fourth layer.

As described above, in the second layer and the third layer, the interlayer connection body is only provided outside the two opposite sides of the electronic component. As a result, there is a problem that when the pressure is applied from the laminating direction in the pressurizing / heating process, the second layer and the third layer interlayer connector are easily displaced.

Therefore, an object of the present invention is to provide a component-embedded substrate in which an interlayer connector provided in a layer adjacent in the stacking direction is less likely to be displaced, and a communication terminal device including the component-embedded substrate.

In order to achieve the above object, one aspect of the present invention provides a multilayer substrate in which a plurality of resin layers are stacked, and an electronic component that is built in the multilayer substrate and has a plurality of terminal electrodes on at least one main surface. Directed toward the component-embedded board provided.

The plurality of resin layers have at least a space for accommodating the electronic component, and at least one first interlayer connection body provided on the outer side of each of at least three sides of the main surface of the electronic component. A first resin layer, a second interlayer connection body provided at least one on each outer side of at least three sides of the main surface, and a plurality of third layers directly joined to the plurality of terminal electrodes And a second resin layer having at least a connection body.

The first resin layer and the second resin layer are adjacent to each other in the stacking direction in the multilayer substrate, and the first interlayer connection body and the third interlayer connection body are directly bonded to each other. Yes.

Another aspect is a communication terminal device including the component-embedded substrate.

According to each aspect described above, a component-embedded substrate that is less likely to be displaced in an interlayer connector provided in layers adjacent to each other in the stacking direction, and a communication terminal device including the same Can be provided.

It is a longitudinal cross-sectional view of the component built-in substrate which concerns on one Embodiment. It is an exploded view which shows the longitudinal cross-section which shows the principal part of the component built-in board | substrate of FIG. It is a bottom view of the 1st resin layer of FIG. It is a top view of the 1st resin layer of FIG. It is a top view of the 2nd resin layer of FIG. It is a bottom view of the 2nd resin layer of FIG. It is a schematic diagram which shows the first process in the manufacturing method of the component built-in board | substrate of FIG. It is a schematic diagram which shows the next process of FIG. 3A. It is a schematic diagram which shows the next process of FIG. 3B. It is a schematic diagram which shows the next process of FIG. 3D. It is a figure when the boundary of the 1st resin layer of FIG. 1 and the 2nd resin layer is planarly viewed from upper direction. It is a bottom view of the 1st resin layer concerning a modification. It is a top view of the 1st resin layer concerning a modification. It is a top view of the 2nd resin layer concerning a modification. It is a bottom view of the 2nd resin layer concerning a modification. It is a schematic diagram which shows the other structural example of the built-in electronic component of FIG. It is a schematic diagram which shows the relationship between the diameter (phi) 1 of the junction surface with the 1st interlayer connection body in the 2nd interlayer connection body of FIG. 1, and the diameter (phi) 2 of the junction surface with the electronic component in a 3rd interlayer connection body. It is a schematic diagram which shows the structure of the communication terminal device which uses the component built-in board | substrate of FIG. It is a schematic diagram which shows the equivalent circuit of the principal part of the communication terminal device of FIG.

(Introduction)
First, the X axis, Y axis, and Z axis shown in several drawings will be described. The X axis, the Y axis, and the Z axis are orthogonal to each other. The Z axis indicates the stacking direction of the plurality of resin layers. For convenience, the positive direction of the Z-axis is set above the component-embedded board. The X axis indicates the left-right direction. For convenience, the positive direction of the X axis is the right direction of the component built-in board. The Y axis indicates the front-rear direction. For convenience, the positive direction of the Y axis is the depth direction of the component built-in board.

(Configuration of component built-in board)
Hereinafter, the configuration of the component-embedded substrate (finished product) according to the embodiment will be described with reference to FIGS. 1 to 4B. 1 is a view of a cross section taken along line AA ′ in FIGS. 3A and 4B as viewed from an arrow B. FIG. The component-embedded substrate 1 includes a multilayer substrate 2, at least one built-in electronic component 3, a surface-mounted electronic component 4, a plurality of pattern conductors 5, a plurality of interlayer connectors 6, a plurality of external electrodes 7, It has.

The multilayer substrate 2 is a laminate in which a plurality of resin layers are laminated. In FIG. 1, in addition to the first resin layer 2c and the second resin layer 2d, a third resin layer 2a, a fourth resin layer 2b, a fifth resin layer 2e, and a sixth resin layer are provided as a plurality of resin layers. 2f and the seventh resin layer 2g are exemplified. Each of the resin layers 2a to 2f is made of a flexible material having electrical insulation. As this type of material, there is a thermoplastic resin. As the thermoplastic resin, liquid crystal polymer and polyimide are typical. A liquid crystal polymer is preferable as a material for the resin layer because of its excellent high frequency characteristics and low water absorption.

The resin layers 2a to 2g have the same rectangular shape in plan view from above. The thickness of each of the resin layers 2a to 2g along the stacking direction Z is about 10 to 100 [μm]. The resin layer 2a is the lowest layer. The resin layer 2b is laminated on the upper surface of the resin layer 2a. Similarly, the resin layers 2c to 2g are laminated on the upper surfaces of the resin layers 2b to 2f. In addition, in FIG. 1, the boundary of the two resin layers adjacent to the lamination direction Z is virtually shown with the dotted line.

The electronic component 3 is built in the multilayer substrate 2. FIG. 1 shows a CSP (Chip Size Package) semiconductor component (hereinafter referred to as an IC chip) as a first example of the electronic component 3. Examples of the IC chip include an RFIC chip and an image processing IC for a digital camera.

A plurality of input / output terminal electrodes are provided on at least one main surface (upper surface in the example of FIG. 1) of the electronic component 3. Specifically, each input / output terminal electrode has a pad electrode 12 provided with the IC chip body 11 and a post electrode 14 exposed on the surface of the rewiring layer 13 as shown in a dotted circle in FIG. The

electrodes

12 and 14 are electrically connected to each other. Here, at least the post electrode 14 is made of copper.

The surface-mounted electronic component 4 is mounted on the surface of the multilayer substrate 2 of the component-embedded substrate 1 as a preferred configuration. The electronic component 4 may be an IC chip as described above, or a passive component such as a capacitor or a resistor.

Each pattern conductor 5 is shown with a right-down hatching in the figure. Each pattern conductor 5 is made of a conductive material such as copper, and is formed in the multilayer substrate 2 as a part of wiring constituting an electronic circuit including the

electronic components

3 and 4. More specifically, the pattern conductor 5 is a strip-shaped or strip-shaped conductor formed on the upper or lower surface of the resin layers 2b to 2g.

In FIG. 1, from the viewpoint of easy viewing of the drawing,

reference numerals

5a, 5b, and 5c are given to only the three pattern conductors without giving reference signs to all the pattern conductors. The pattern conductor 5a is formed on the lower surface of the resin layer 2c, and the

pattern conductors

5b and 5c are formed on the upper surface of the resin layer 2d. Hereinafter, the formation positions of the pattern conductors 5a to 5c will be described in more detail.

As shown in FIG. 3A, a plurality of pattern conductors 5a are provided around the space C1 in which the electronic component 3 is accommodated. Here, the space C1 has a rectangular shape in plan view from the stacking direction Z. Most of these pattern conductors 5a are in contact with and joined to the lower end side of at least one interlayer connector 6a (described later).

As clearly shown in FIG. 4B, a plurality of pattern conductors 5b are provided around the space C1 (indicated by a dotted line) when viewed in plan from the stacking direction Z. These pattern conductors 5b are in contact with and joined to the upper end side of at least one interlayer connector 6b (described later).

The pattern conductor 5c is provided in the central portion of the resin layer 2d, more specifically, at a position corresponding to the input / output terminal electrode of the electronic component 3. An upper end of an interlayer connector 6c (described later) is in contact with and bonded to the pattern conductor 5c. Most of the pattern conductors 5c are electrically connected to any of the surrounding pattern conductors 5b.

In the present embodiment, at least the pattern conductors 5a to 5c are wiring patterns and are used for signal transmission. In FIG. 1, other pattern conductors are also shown as wiring patterns without reference numerals. However, other pattern conductors may be pattern conductors for forming capacitors, coils, and the like.

The plurality of interlayer connection bodies 6 are shown with a downward-sloping hatching in the figure. Each interlayer connection 6 is typically made of a conductive material such as a metal mainly composed of tin and silver or an alloy thereof. Similarly to the pattern conductor 5, the interlayer connector 6 is also a part of the wiring that constitutes the electronic circuit, and the resin layers 2a to 2f are vertically arranged at predetermined positions of the resin layers 2a to 2f. To penetrate.

In FIG. 1, from the viewpoint of easy viewing of the drawing, reference numerals 6a to 6c are attached to the three kinds of important interlayer connectors instead of attaching the reference numerals to all the interlayer connectors 6. Interlayer connection body 6a is provided in resin layer 2c, and

interlayer connection bodies

6b and 6c are provided in resin layer 2d. Hereinafter, the formation positions of the respective interlayer connectors 6a to 6c will be described in more detail.

Each of the first interlayer connection bodies 6a is interposed between the pattern conductor 5a and the interlayer connection body 6b provided directly above itself in the resin layer 2d in a plan view from above the component-embedded substrate 1. The pattern conductor 5a and the interlayer connector 6b are electrically connected. Further, as clearly shown in FIG. 3B, at least one interlayer connection 6a is provided on the outer peripheral side of the resin layer 2c with reference to each of the four sides of the rectangular space C1. In other words, at least one interlayer connector 6a is provided between one side of the space C1 and one side of the resin layer 2c close to and parallel to this side. The same applies to the remaining three sides of the space C1. In the example of FIG. 3B, three interlayer connectors 6a are provided on the outer peripheral side with respect to each side of the space C1.

Each of the second interlayer connectors 6b is interposed between the pattern conductor 5b and the interlayer connector 6a provided directly below the resin layer 2c in plan view from above. More specifically, the interlayer connector 6b is directly joined to the corresponding interlayer connector 6a. Thereby, the interlayer connector 6b electrically connects the pattern conductor 5b and the interlayer connector 6a. Each interlayer connection 6b is provided so as to overlap with the corresponding interlayer connection 6a in plan view from above. That is, as clearly shown in FIG. 4A, at least one interlayer connection 6b is provided on the outer peripheral side of the resin layer 2c with respect to each of the four sides of the rectangular space C1 (shown by dotted lines). In the example of FIG. 4A, three interlayer connectors 6b are provided on the outer peripheral side with respect to each side of the space C1.

The third interlayer connector 6c is provided at the center of the resin layer 2d, more specifically at a position corresponding to the pattern conductor 5c. The interlayer connection 6c is directly joined to the corresponding pattern conductor 5c and the input / output terminal electrode of the corresponding electronic component 3, and electrically connects the pattern conductor 5c and the input / output terminal electrode.

Here, the interlayer connectors 6a to 6c preferably have larger diameters as they approach the interface between the resin layers 2c and 2d. Thereby, the contact area of interlayer connection bodies 6a and 6b and the contact area of interlayer connection body 6c and the input / output terminals of electronic component 3 can be maximized. Interlayer connectors 6a and 6b preferably have substantially symmetrical shapes with respect to the boundary surface between

resin layers

2c and 2d. As a result, the connection reliability between the electronic component 3 and the interlayer connector 6c is improved.

Also, as described above, each interlayer connection 6b is directly joined to the corresponding interlayer connection 6a. The interlayer connector 6c is directly bonded to the input / output terminal electrode of the corresponding electronic component 3. In other words, there is no pattern conductor between the interlayer connectors 6a and 6b and between the interlayer connector 6c and the input / output terminals. As a result, the flatness of the surface of the multilayer substrate 2 can be improved.

The plurality of external electrodes 7 are made of, for example, the same conductive material as the pattern conductor, and are formed on the lower surface of the resin layer 2a in order to mount the component built-in substrate 1 on another circuit board. In FIG. 1, external electrodes 7a and 7b are shown as a plurality of external electrodes 7. The external electrodes 7a and 7b are formed of a pattern conductor 5 formed on the lower surface of the resin layer 2b and a corresponding interlayer connector 6. Are electrically connected.

(Manufacturing method of component built-in board)
Next, a method for manufacturing the component-embedded substrate 1 will be described with reference to FIGS. 5A to 5D. Hereinafter, a manufacturing process of one component-embedded substrate 1 will be described. Actually, a large-sized resin layer is laminated and cut to produce a large amount of component-embedded substrates 1 at the same time.

First, the required number of large-sized resin layers having copper foil formed on almost the entire surface are prepared. Each large resin layer becomes one of the resin layers 2a to 2g after the component-embedded substrate 1 is completed. Therefore, as shown in FIG. 5A, large resin layers 9a to 9g corresponding to the resin layers 2a to 2g are prepared. As described above, each of the resin layers 9a to 9g is preferably a liquid crystal polymer having a thickness of about 10 to 100 [μm]. The thickness of the copper foil is about 10 to 20 [μm]. In addition, it is preferable that the surface of copper foil is plated with zinc etc. for rust prevention, and is planarized.

Next, as shown in FIG. 5A, a plurality of external electrodes 7 (including external electrodes 7a and 7b) are formed on one surface (that is, the bottom surface) of the resin layer 9a by a photolithography process. More specifically, first, a resist having the same shape as each external electrode 7 is printed on the copper foil of the resin layer 9a. Thereafter, an etching process is performed on the copper foil, and the exposed copper foil not covered with the resist is removed. Thereafter, the resist is removed. Thereby, the some external electrode 7 is formed in the one surface of the resin layer 9a.

Further, by the same photolithography process as described above, as shown in FIG. 5A, the pattern conductor 5a is formed on one surface (that is, the lower surface) of the resin layers 9b and 9c.

Further, by the same photolithography process as described above, as shown in FIG. 5A, at

least pattern conductors

5b and 5c are formed on one surface (that is, the upper surface) of the resin layer 9d. The detailed formation positions of the pattern conductors 5a to 5c are as described above.

Further, by the same photolithography process as described above, as shown in FIG. 5A, the pattern conductor 5 is formed on one surface (that is, the upper surface) of the resin layers 9e to 9g.

Next, as shown in FIG. 5B, the other surface side (that is, the external electrode 7) is formed at the position where the interlayer connection body 6 (see the portion with the right-down hatching) is to be formed in the resin layer 9a. The laser beam is irradiated from the side that is not. As a result, through holes are formed, and then each of the formed through holes is filled with a conductive paste. This conductive paste is made of a metal mainly composed of tin and silver, or an alloy thereof, and has thermosetting property and viscosity.

Similarly to the resin layer 9a, through holes are formed in the resin layers 9b to 9g, and each of them is filled with the conductive paste. In particular, with respect to the resin layer 9c, a laser beam is irradiated from the other surface side (the surface side where the pattern conductor 5a is not formed) to a position where the interlayer connector 6a is to be formed. The through-holes thus formed are filled with the conductive paste. In particular, with respect to the resin layer 9d, a laser beam is irradiated from the other surface side (the surface side where the

pattern conductors

5b and 5c are not formed) to the position where the

interlayer connectors

6b and 6c are to be formed. The through-holes thus formed are filled with the conductive paste. The formation positions of the interlayer connectors 6a to 6c are as described above.

Next, as shown in FIG. 5C, the electronic component 3 is mounted at a predetermined position on the other surface (that is, the lower surface) of the resin layer 9d. Specifically, the electronic component 3 is positioned so that each input / output terminal electrode of the electronic component 3 is positioned at the lower end of the corresponding interlayer connector 6.

Further, in the resin layers 9b and 9c, a portion in which the electronic component 3 is to be accommodated is punched by a mold. As a result, a space C1 is formed in the resin layer 9c, and a space C2 is formed in the resin layer 9b. The spaces C1 and C2 have a size slightly larger than the outer shape of the electronic component 3 in plan view from above.

Next, as shown in FIG. 5D, the resin layers 9a to 9g are stacked in this order from the bottom to the top. Here, the resin layer 9a on which the external electrode 7 is formed is laminated so that the surface on which the external electrode 7 is formed faces downward. The resin layers 9b and 9c are laminated so that the formation surface of the pattern conductor 5 faces downward. The remaining resin layers 9d to 9f are laminated so that the formation surface of the pattern conductor 5 faces upward.

Thereafter, heat and pressure are applied to the stacked resin layers 9a to 9f from both the upper and lower directions (indicated by arrows Za and Zb). By this pressurization and heating, the resin layers 9a to 9f are softened and are pressure-bonded and integrated, and the conductive paste in each through-hole is solidified to form each interlayer connection body 6.

Here, as described above, the conductive paste in the through hole is mainly composed of tin and silver, and the input / output terminal electrode (particularly, the post electrode 14) of the electronic component 3 is made of copper. As described above, the conductive paste and the post electrode 14 are alloyed (Sn—Cu alloy) at the joining portion in the pressurizing / heating step, and the mechanical strength of this portion can be improved. .

When the pressurizing / heating process is completed, the plurality of surface-mounted components 4 are mounted on the integrated resin layers 9a to 9g, and then cut into a predetermined size. As a result, a component-embedded substrate 1 (see FIG. 1) in which an electronic circuit including the electronic component 3 and the surface-mounted electronic component 4 is built in the multilayer substrate 2 is completed.

(Operation and effect of component built-in board)
In the pressurizing / heating step, the resin layers 9a to 9g flow. Particularly, the fluidized resin layer 9d flows into the space C2, and the spaces C1 and C2 are filled with resin. If a pattern conductor is interposed between the resin layers 9c and 9d and around the electronic component 3, the fluidized resin layer 9d may be prevented from flowing into the space C2. As a result, there is a possibility that a good bonding state between the interlayer connector 6c and the input / output terminal electrodes of the electronic component 3 cannot be secured. From such a background, each interlayer connection body 6b and the corresponding interlayer connection body 6a are directly joined without interposition of other pattern conductors, thereby ensuring good resin fluidity. .

However, if the pattern conductor is removed in this way, the interlayer connectors 6a and 6b are likely to be displaced from each other in the pressurizing / heating process. Further, in the pressurizing / heating process, the resin layers 9a to 9g, the pattern conductor 5 and the interlayer connector 6 are bonded to the electronic component 3 and the interlayer connector 6c due to a difference in thermal expansion coefficient and contraction behavior. There is a possibility that stress is applied and the connection reliability of these is lowered.

Therefore, as shown in FIG. 6, the interlayer connectors 6a and 6b are arranged at least on the outer peripheral side of the resin layer 2c with respect to each of the four sides of the rectangular space C1 (that is, the electronic component 3) in plan view from above. It is provided one by one. The interlayer connectors 6a and 6b are conductive pastes that are still viscous at the start of the pressurizing / heating process. In this way, due to the viscosity of the interlayer connectors 6a and 6b provided so as to surround the periphery of the electronic component 3, deformation of the resin layer that may occur in the pressurizing / heating process (for example, the resin layer 9d warps from the resin layer 9c). It is possible to prevent (attempting to leave). Further, even when a stress in an arbitrary direction is applied to the resin layers 9c and 9d during pressurization and heating, the alignment effect is obtained by the viscosity of the interlayer connectors 6a and 6b provided so as to surround the periphery of the electronic component 3. In addition, the stress can be absorbed to prevent the resin layers 9c and 9d from being displaced, and hence the interlayer connectors 6a and 6b from being displaced.

Also, as shown in the dotted line in FIG. 1, a plurality of interlayer connectors 6 are arranged in the vertical direction on the side of the electronic component 3. It is preferable that at least two of these interlayer connectors 6 are provided at different positions in plan view from above. Thereby, the flatness of the upper and lower surfaces of the multilayer substrate 2 can be improved.

(Modification)
In the above embodiment, as shown in FIGS. 3A to 4B, the interlayer connectors 6a and 6b are provided on the outer side with respect to each side of the space C1 (that is, the electronic component 3) in a plan view from above. Explained the example. However, the present invention is not limited to this, and as shown in FIGS. 7A to 8B, the interlayer connectors 6a and 6b are provided outside with respect to the three sides of the space C1 (that is, the electronic component 3) in plan view from above. It does not matter.

(Appendix)
In the above embodiment, an example in which the spaces C1 and C2 are formed in the manufacturing process has been described. However, the present invention is not limited to this, and the component-embedded substrate 1 may be manufactured without forming the spaces C1 and C2.

In the embodiment described above, the electronic component 3 has been described with respect to the example in which the rewiring layer 13 is provided on the IC chip body 11 as shown in FIG. However, the present invention is not limited to this, and the electronic component 3 may have a structure as shown in FIG. That is, a UBM (under bump metal) 101 is formed on the Si substrate 100 and the periphery thereof is covered with the SiO ₂ layer 102. A polyimide layer 103 is formed on the SiO ₂ layer 102. Input / output terminal electrodes made of copper or the like are formed on the polyimide layer 103.

In the above embodiment and the modification, the plurality of interlayer connectors 6a and 6b are provided on each of the three sides or the four sides of the space C1 (that is, the electronic component 3) in plan view, but one or more interlayers are provided for each side. If the connection bodies 6a and 6b are provided, the above effects can be obtained. However, the provision of the plurality of interlayer connectors 6a and 6b on each side as in the above-described embodiment and the modified example can surely prevent the displacement of the resin layers 9c and 9d and the displacement of the interlayer connectors 6a and 6b. Therefore, it is preferable. In particular, the plurality of interlayer connectors 6a and 6b are most preferably provided so as to surround the space C1 (that is, the electronic component 3) in plan view.

Besides, the electronic component 3 may be a passive component such as a capacitor or a resistor. This passive component has terminal electrodes provided at both ends so as to cover up to a part of two main surfaces facing the stacking direction Z.

Further, the diameter of the joint surface of the interlayer connector 6b with the interlayer connector 6a is φ1, and the diameter of the joint surface of the interlayer connector 6c with the input / output terminal electrode of the electronic component 3 is φ2. FIG. 1 shows a case where φ1 is substantially the same as φ2. However, not limited to this, as shown in FIG. 10, φ1 and φ2 may satisfy φ1> φ2.

Incidentally, in recent years, the IC chip (that is, the electronic component 3) has been miniaturized and multi-functionalized. In order to cope with this, it is necessary to reduce the diameter of the input / output terminal electrodes. However, when the diameter of the input / output terminal electrode is reduced, the problem of connection reliability arises. Therefore, by setting φ1> φ2, this problem can be dealt with. Further, by satisfying φ1> φ2, it is possible to protect the joint portion between the input / output terminal electrode of the IC chip and the interlayer connector 6c from the impact applied to the multilayer substrate 2 from the periphery.

(Application example of component built-in board)
For example, as illustrated in FIG. 11, the component-embedded substrate 1 according to the embodiment is used in a communication terminal device 30 on which a 13.56 MHz band RFID (Radio Frequency IDentification) antenna module is mounted. Examples of such RFID include NFC (Near Field Communication) and FeliCa (registered trademark). Here, FIG. 11 shows various components and various members arranged in the housing 32 of the communication terminal device 30 when the housing cover 31 is opened. The communication terminal device 30 is typically a mobile phone or a smartphone, and in addition to the component-embedded substrate 1, for example, a printed wiring board 33, a coil antenna 34, a booster antenna 35, It has. In addition to the above, a battery pack, a camera, a UHF band antenna, and various circuit elements are mounted and arranged at high density inside the housing 32, but these are not the main parts of the present invention. The description is omitted.

The coil antenna 34 is mounted on the printed wiring board 33 together with the component built-in substrate 1. Further, as shown in the equivalent circuit of FIG. 12, the external electrodes 7 of the component-embedded substrate 1 are connected to both ends of the coil antenna 34.

Further, the booster antenna 35 is attached to the casing cover 31 so as to be disposed so as to face the coil antenna 34 when the casing cover 31 is closed. The booster antenna 35 is, for example, a planar spiral coil or the like, and is provided to extend the communication distance of the coil antenna 34.

In addition to the above, a memory with an encryption function, a capacitor element, and an inductor element can be integrated with the component-embedded substrate 1 as the electronic component 3. As a result, it is possible to reduce transmission loss and unnecessary electromagnetic coupling due to wiring routing in the communication terminal device 30. In addition, it is possible to reduce the mounting space for components.

In the above description, the component-embedded substrate 1 is applied to the 13.56 MHz band RFID. The component-embedded substrate 1 can also be applied to a wireless communication system using the UHF band, such as W-LAN.

(Quoted by reference)
This application claims priority based on Japanese Patent Application No. 2012-239780 filed on October 31, 2012, and incorporates all the contents of the Japanese Patent Application by reference. is there.

The component built-in substrate and the communication terminal device according to the present invention are capable of individually inspecting electronic components and reducing the wiring space, and can be used in portable electronic devices such as mobile phones and digital cameras, and modules used therefor. Is preferred.

DESCRIPTION OF SYMBOLS 1 Component built-in board | substrate 2 Multilayer board | substrate 2c 1st resin layer 2d 2nd resin layer 3 Electronic component 4 Surface mount type component 5 Pattern conductor 6 Interlayer connection body 6a 1st interlayer connection body 6b 2nd interlayer connection body 6c 3rd interlayer connection Body 7 External electrode

Claims

A component-embedded substrate comprising a multilayer substrate in which a plurality of resin layers are laminated, and an electronic component that is embedded in the multilayer substrate and has a plurality of terminal electrodes on at least one main surface,
The plurality of resin layers are at least
A space for accommodating the electronic component is formed, and a first resin layer having a first interlayer connection body provided at least one outside each of at least three sides of the main surface of the electronic component;
A second resin having at least a second interlayer connection body provided at least one outside each of at least three sides of the main surface, and a plurality of third interlayer connection bodies that are directly bonded to the plurality of terminal electrodes. A layer, and
The first resin layer and the second resin layer are adjacent to each other in the stacking direction in the multilayer substrate, and the first interlayer connection body and the second interlayer connection body are directly bonded. Component built-in board.
2. The component-embedded substrate according to claim 1, wherein a plurality of the first interlayer connection body and the second interlayer connection body are provided outside each of the three sides.
In the plan view from the normal direction of the main surface of the electronic component, the first interlayer connection body and the second interlayer connection body surround the main surface on the outer sides of the four sides of the main surface, The component-embedded substrate according to claim 1, wherein a plurality of components are provided.
4. The component built-in board according to claim 1, wherein an alloy layer is formed in a manufacturing process at a joint portion between each terminal electrode and each third interlayer connector.
The diameter of each of the first interlayer connection body and the second interlayer connection body is larger as approaching the boundary between the first resin layer and the second resin layer. The component-embedded board described.
The component built-in board according to claim 5, wherein each of the first interlayer connection body and the second interlayer connection body has a substantially symmetric shape with respect to a boundary between the first resin layer and the second resin layer. .
The component-embedded substrate according to any one of claims 1 to 6, wherein another electronic component is mounted on the surface of the multilayer substrate.
The component-embedded substrate according to any one of claims 1 to 7, wherein each of the resin layers is made of a thermoplastic material.
A communication terminal device comprising the component-embedded substrate according to any one of claims 1 to 8.